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          When I got there, they         the old people clean the house.
          A、helped                  
          B、are helping         
          C、were helping
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          

          解析試題分析：句意：當(dāng)我到那的時(shí)候，他們正在幫老人打掃房間。when引導(dǎo)時(shí)間從句用過去時(shí)，主句用過去進(jìn)行時(shí)，結(jié)合句意，故選C
          考點(diǎn)：考查時(shí)態(tài)的用法
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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